Machine for making tubes from hollow ingots



(N0 MpdeL) 2 Sheets-Sheet 1. S. P. M. TASKER.

MAGHINE FOR MAKING TUBES FROM HOLLOW INGOTS.

No. 331,584. Patented Dec 1, 1885.,

WITNESSES: INVEiTOR W r M1 L N PETERS. Plmloiiihogmphcn Washmgmn. n c.

(No MQaeL 2 Sheet sShet 2.- S. P. M. TASKER.

MACHINE FOR MAKING TUBES-FROM HOLLOW INGOTS. No. 331,584. Patented Dec. 1, 1885.

l flllllllllllllllilllllllll WITNESSES:

UNITED STATES PATENT OFFICE,

STEPHEN P. M. TASKER, OF PHILADELPHIA, PENNSYLVANIA.

MACHINE FOR MAKiNG TUBES FROM HOLLOW INGOTS.

EBPECIFICATION forming part of Letters Patent No. 331,584, dated December 1, 1885,

Application filed July 20, 1585. Serial-No. 172,044. No model.)

To ctZZ whom it may concern.-

Be it known that I, STEPHEN P. M. TASKER, a citizen of the United States, residing inthe city and county of Philadelphia, and State of Pennsylvania, haveinvented certain Improvements in Machines for Making Tubes from Hollow Metal Ingots, of which the following is a specification.

Ihe object of my invention is the manufacture of a tube from a hollow cylindriform metal ingot by rolling, either hot or cold, by means of the machine hereinafter described, the said ingot down and out upon a mandrel at least of the required length of the tube to be formed, thereby compacting and consolidating the substance of the metal of the ingot, thinning or reducing the latter in thickness, and elongating it until the required proportions are attained. The ingots which I employ are tubular, or of a hollow cylindriform structure, of any metal, and either open at both ends, closed at one end, or closed at one end and provided through such closed end with an aperture for the traction rod of a mandrel.

As my machine is of especial applicability to the making of steel tubes, I contemplate also the employment of a steel cast ingot of a character invented by me, two applications for patents for which were filed in the United States Patent Office upon the 14th day of May, 1885, and respectively numbered 165,695 and 165,696.

Heretofore in the art of metal rolling two or more pairs or sets of equalsized concavefaced rolls, the two rolls constituting the respective sets or pairs of which, being placed the one over the other, have. crossed each otherthat is to say, have been adjusted in such manner that Vertical planes respectively projected from their respective longitudinal axes have intersected each other at other than a right angle-have been, in successive disposition in the same machine, employed for rounding, straightening, and sizing tubes and rods, the said tubes or rods having been passed through the passes of the successive sets in a direction which may, for the purpose of explanation, be described as right angular to a common imaginary longitudinal axis of each pair of rolls or in a direction much more nearly right angular to than parallel with the longitudinal axis of each individual roll of each pair. In such a machine all of the rolls upon a given side of the line of feed of the rod have, moreover, been arranged in a common frame, with their axes parallel, and all of the rolls upon the other side of said line of feed have likewise been arranged in another common frame, with their axes parallel, but angularly-disposed with respect to, or cross ing, so to speak, the axes of the other series, the passes of all the sets having been of the same diameter, and a common simultaneous adjustment of all of the passes having been the only adjustment thereof possible. Heretofore, also, in the art of metal-rolling two or three equal-sized rolls having concave workingfaces have been arranged in a suitable honsing obliquely side by side or one over the other, or spirally, as it were, around a common central imaginary longitudinal axis of the set, so that the axes of the respective rolls forming such set have been inclined to each other in different planes, and each and all at an angle to the said commonlongitudinal axis, which is that of the article to be rolled, the saidarticlehaving been introduced th rough a pass extending longitudinally between or through, so to speak, the rolls, (which pass, as is well known, is an extended straight bearing obtained between the roll-faces in a line bisectiug the angle of inclination of the rolls,) and the said machines, as such, having been employed for rolling, finishing, reducing, straightening, and smoothing rods, tubes, shafting, and other cylindrical or tubular articles which receive a spiral or combined rotary and progressive movement from the rolls, which not only form the article to a true cylindrical shape, but at the same time feed it forward.

I am not aware that sets of rolls arranged in the foregoing manner have been arranged in series.

Assuming a set of rolls of the character last above described as a given type, I may assume a set of rolls of the character first above described as another given type, and may define the distinguishing characteristic of the two types to be the direction in which the article to be rolled is passed through the set of rollsthat is to say, whether it be passed through them in a direction right angular to what we may term their common axis, as in the case of the rolls first described, or parallel or coincident with said common axis, as in the case of the rolls last above described.

I have discovered that a superior merchantable tube of metal, but especially a steel tube, can be economically and successfully manufactured, either from a tubular metal, or especially from a hollow steel cast ingot, by employing, in conjunction with a series of sets of concavefaced rolls, the rolls of each of which sets cross each other, and the reducingpasses of which sets are successively smaller, a mandrel adapted to be rotated with the ingot upon it, and at least of the required length of the tube to be formed from said ingot, which mandrel is passed through the passes of the sets in a direction right angular to their common axis, and upon which mandrel the substance of the metal of the ingot is by the rolls compacted and consolidated, and the ingot itself thinnedor reduced in thickness, and elongated until the required proportions are attained.

Apparatus embodying a good form of my invention is represented in the accompanying drawings and described in this specification, the particular subj cot-matter claimed as novel being hereinafter definitely specified.

In the accompanying drawings, Figure 1 is a top plan View of an apparatus conveniently embodying a good form of my improvements, and containing a series of two sets of rolls, an ingot having a closed advance end being shown in position upon the mandrel and undergoing reduction in its passage through the rolls in the direction of the arrow upon it. central vertical longitudinal sectional elevation of the apparatus represented in Fig. 1, section being supposedin the plane of the dotted line'xx of Fig.1, and sight being taken in the direction of the arrows upon said line, the reduction of the ingot being also illustrated, and the latter being closed at one end and provided through its closed end with an aperture through which the traction-rod of the mandrel is represented as having been passed. In Fig. 1 it is to be assumed that the mandrel is forced from behind through the rolls. In Fig. 2 it is to be assumed that the mandrel is being both forced and drawn, or drawn only. Fig. 3 is an end elevational view ofthe apparatus of Fig. 1, sight being taken from the left-hand end of said Fig. 1, but such a mandrel and ingot as are represented in Fig. 2 being shown in the pass. Fig. 4 is a fragmentary side elevational detail of one of the cylindriform segments, 0, of the housing 0, it being that segment .to which the arrow aon said Fig. 1 points. Fig. v5 is a face View of one of the rolls ,andof one of the adjustable boxings in which one of its axles is journaled, the said boxing and the radial adj usting-arm thereon, anda portion of one of the cylindriform segments of a housing and of the pro- Fig. 2 isa j jecting flange thereon being represented in a sectional View projected on a plane which passes through both the axis of the roll and that of the radial adjusting-arm. The view is in the nature of an explanatory diagram, and is neither drawn to scale nor isometrically correct. Fig. 6 is a detail illustrating how the mandrel may be swiveled to a mandrel-head or cross-bar, S, of a mandrel frame or carriage.

Similar letters of reference indicate corresponding parts.

In the drawings, A represents any suitable bed or foundation for supporting the housings within which the rolls arejournaled.

M is the advance portion of a cylindrical mandrel, which is at least of the length of the tube to-be produced, and which is adapted to be rotated upon its longitudinal axis by any convenient meansas, for instance, by swiveling its rear extremity in the mandrel frame or carriage S.

In the drawings no representation other than that of a mandrel-frame head'in section is made of any means for occasioning the advance or retraction of the mandrel through the passes of the rolls, for the reason that I assume such representation to be unnecessary, because the various appliances in common use for actuating the mandrels of rolling-mills are well known to iron-masters. I assume it, however, to be understood that a suitable mechanism, which may be of any preferred character, is to be applied to the mandrel to cause the advance or retraction of said mandrel at any predetermined speed through the passes of the rolls.

B is an ingot upon the mandrel.

0 O are two longitudinally-extending parallel housings vertically erected from the bed or foundation, and either cast solid therewith .or bolted vor otherwise secured thereto. The housings, in the form of apparatus shown in the drawingsand it is to be borne in mind that the series may contain a greater number of sets of rolls than two-support two successively-placed sets of rolls, the rolls of the first set of which are marked D, while the rolls of the second set are marked E. The two rolls of each set may be relatively of the same size; but the concave working-surfaces of the two rolls of the second set are to be more filled in, so to speak, than the working-surfaces of the rolls of the first set -t,hat is to say,the diameter of thecen-tral portions of the rolls of thesecond set is tobe greater than thatof the rolls of the first set, so that the normalpass of the second set may be diametrically smaller than the normal pass of the first set, and this normal relation of successively-diminishing passes is to be preserved whatever number of sets of rolls happens to be employed. The two rolls of eachset are respectively adjusted one above the other, and their axes, whatever for the time being'be the adjustment of the rolls, must always cross at an angle other than a right angle, and which is such as .to cause the concave working-surfaces of the said two rolls to IOR IIO

always present, in any desired angular relationship not right angular, a pass which,

viewed from the end of the machine, is,as shown in Fig. 3, practically circular whatever its diameter may be, for of course the rolls separate and their pass increases diametrically as the angle of their axes increases.

The journaling or housing of each set ofthe rolls and the means for adjusting the said two rolls of each set, are preferably precisely similar throughout any number of sets which may be employed. I will therefore describe the same with reference to but one set of rolls.

Each housingin the region of its support of a set of rolls has preferably the formof asegment of a vertical cylinder, the said cylindrical segments being marked 0 0* in the drawings; or, at least, the said housings are vertically cylindrically concaved on their adjacent central vertical axis, which is midway between them. The axles d of the rolls are preferably entered withinadjustable boxings or bearings F F which are, as shown in Fig. 5, respectively fitted with respect to and adapted to have both arotary and a longitudinal movement within reversely-disposed segmentalways H, formed in opposite pairs in the respective cylindrical segments of the housings, and two of which are, as to each housing, projected in what may be termed diagonally-quartered relationship upon a coin mon radius from a common center, which is concentric with what I have characterized the common longitudinal axis of' the rolls of the set under consideration, and is about midway of the vertical depth of the said cylindrical segments, as will be more clearly understood by a reference to the drawings. By

virtue of these pairs'of reversely-disposed segmental ways, within which the axles of the rolls are, as shown, entered, the movement of the rolls of each pair for increasing ordimin ishing the diameter of their pass becomes both certain and easy.

To render easy the adjustment of the rolls, I have devised the following convenient means of adjustment: A radially-projecting threaded adj usting-arm, f or f", is attached to drawings will also make clear.

justing-arms to secure the locking of the arm j j are jam-nuts applied to the radialiad to which they are respectively applied at given positions with respect to its range of play within the slot of its flange.

A suitable arrangement or disposition of the segmental ways for the axle-boxings with respect to the cylindriform segments of the housings is represented in the drawings, and will be easily understood by a reference thereto. The corresponding segmental ways in opposite cylindrical segments are of course diagonally opposite.

The segmental ways, axle-boxings adjustable therein, radial. nut-provided arms connected with said boxings, and projecting slottedfianges for the maintaining of the arms when locked, and consequently of the axles and rolls, in predetermined positions, together constitute simply a composite roll-adjusting contrivance, the office of which is to permit of and render easy the adjustment of any given pair (or of all the pairs) of rolls atdifferent relative angles, and" consequently, by reason of the play of their boxings in the reversely-disposed segmental ways, nearer together or farther apart, so as to increase or lessen the diametric measurement of the pass between them, and adapt them for employment with mandrels and ingots ofvarying diameters. Any other adjusting device operating to a similar result may, however, be substituted in the stead of the foregoing. It is proper also to remark that the boxings may be dispensed with and the axles otherwise housed or entered simply in the segmental ways, in which event means for fixed adjustment of the rolls is to be applied to the axles, and not to the boxings.

The housings constitute a most convenient framing; but the segmental ways may be formed independently of or supported separately from the said housings.

Having now described what I believe to be a convenient embodiment of my invention, and at the same time described the operation of the machine, it is proper for me to add that I-believe myself to be the first to use a mandrel capable of rotation about its longitudinal axis and of the length of the tube which is to be produced, in conjunction with a series of sets of angularly-disposed or crossingconcave faced rolls having successively diminishing passes,,hy which arrangementit is possible to ing the adjusted rolls which I have represented and described are well adapted for the purpose, yet they are not essential to my inven tion. The special adj usting devices described, or others operating to substantially the same result, however, permit of the adjustment of the rolls by one movement to accommodate any size of ingot within their range of separation. WVhatever, moreover, may be the diameters of the passes of the rolls, all of the upper rolls' throughout the series will be parallel with each other and all the lower rolls in like manner parallel, and this notwithstanding the fact that the pass diminishes with each succeedmg set. This capability of adjustment .while the parallelism of the rolls is preserved .is most important, as otherwise the rolls of the several sets would not. act harmoniously,

.but would tend to roll the metal in different directions, owing to their irregularly-divergent angular positions; and it will therefore be understood why it is preferable to have all the .rolls of each set of. the same size, but to have the diameters of the concave working-faces of the rolls of different sets different. It is, however, proper to state that while I have herein recited as the best construction that the con cave working-surfaces of the two rolls of the ond set should be more filled in than the working-surfaces of the rolls of the first setthat is to say, should be of greater diameter at their central portions than the rolls of the first .set, and so on throughout the seriesyet all of .the rolls of all of the sets may, if desired, be of I the same diameter, and the successively-d iminishing diameters of the pairs besecured simply by the adjustment of each succeeding set. This construction would of course prevent the parallelism of all the upper rolls and all the lower rolls, and would not conduce to an equally successful manufacture. It would, however, be a .possible construction, and is of a character clearly within my invention and contemplated by me. WVhile it is preferable that the passes of the succeeding sets should successively diminish-that is to say, diminish in strict consecution set by set, and without variance, omission,.or alternationyet all the results which flow from consecutive diminution may be obtained by making,for instance,two consecutive or adjoining sets of a given and the same diameter of pass, by making the two immediately succeeding consecutive or adjoining sets of a lesser but of the same diameter of pass, and

by making the two further immediately succeeding consecutive or adjoining sets of a still lesser but of the same diameter of pass. This arrangement or one kindred to it-the number or series of sets of similar diameter of pass .employed not being vitalis not desirable;

but it is manifestly embraced within my invention, and the terms successive or gradual diminution herein employed are not be understood vas employed with literal exactness.

As already'stated, the,mandrel, which may be of any desired kind, may be driven at any predeterminedspeedandbyanypower. When driven with the ingot upon it, it occasions the actuation of the rolls, all of which are idlerrolls, in that they are not positively driven, but are simply caused to rotate by the friction of the ingot.

The ingots may be rolled down either hot or cold.

The spiral or revolving progressive motion to which the ingot on the mandrel, and with it themandrel to which it for the time being adheres, is subjected prevents filming or irregularities of any kind, and therefore tends to produce a uniformly-cylindric and very marketable tube.

The mandrel may be extracted from the tube after rolling by stretching the tube, by

loosening the mandrel, and by extracting the latter by any suitable means.

It is proper to add that my machine without the mandrel is well adapted for reducing the diameters of tubes or rods, and, if desired,

by a suitable adjustment of its several passes,

for rounding, straightening, and finishing such products, it being simply necessary for any such ,and executed and filed contemporaneously I do not, moreover, claim herein.-

with this. the mandrel, per 86, when employed with a set of concave-faced cross-rolls, nor yet the housing provided with segmental ways, nor, again, the roll-adjusting devices, as these features constitute the subject-matter of another application contemporaneously executed and filed, and designated by me Case A, No. 1.

Having thus described my invention, I claim and desire to secure by Letters Patent 1. In a machine for making tubes from hollow metal ingots, the combination of a series of sets'of concave-faced rolls, each, of which sets consists of a pair of concave-facedrolls arranged with their axes inclined to eachother,

and the passes of such set-s diminish in diameter, with a mandrel at least as long as the tube to be formed,and which is passed through the passes formed by the rolls of the successive sets in a direction right angular to the common axis of each pair or setof rolls, substantially as set forth. 2. In a machine for making tubes from hollow metal ingots, the combination of a series of sets'of concave-faced rolls, each of which sets consists of a pair of concave-faced rolls arranged with their axes inclined to each other,

and the passes of such sets diminish in diameter, with a mandrel adapted to be rotated about its longitudinal axis,at least as long as the tube to be formed, and which is passed through the passes formed by the rolls of the successive sets in adirection right angular to the common axis of each pair or set of rolls, substantially as set forth.

8. In a machine for making tubes from hol low metal ingots, the combination of a series of sets of concave-faced rolls, each of which sets consists of a pair of concave-faced rolls arranged with their axes inclined to each other, and the concave working-faces of the rolls of each succeeding set of such series are more filled in and of greater diameter than the rolls of the set immediately preceding, so that the passes of the sets gradually diminish in diameter, with a mandrel at least as long as the tube to be formed, and which is passed through the passes formed by the rolls of the successive sets in a direction right angular to the common axis of each pair or set of rolls, substantially as set forth.

4. In a machine for making tubes from hollow metal ingots, the combination of aseries of sets of concave-faced rolls, each of which sets consists of a pair of concave-faced rolls arranged with their axes inclined to each other, and the concave working-faces of the rolls of each succeeding set of such series are more filled in and of greater diameter than the rolls of the set immediately preceding, so that the passes of the sets gradually diminish in diameter, with a mandrel adapted to rotate about its longitudinal axis, at least as long as the tube to be formed, and which is passed through the passes formed by the rolls of the successive sets in a direction right angular to the common axis of each pair 'or set of rolls, substantially as set forth. I

5. In a machine for making tubes from hollow metal ingots, the combination of a series of sets of concave-faced rolls, each of which sets consists of a pair of concave-faced rolls arranged with their axes inclined to each other, and the passes of such sets diminish successively in diameter, with a mandrel at least as long as the tube to be formed, and which is passed through the passes formed by the rolls of the successive sets in a direction right angular to the common axis of each pair or set of rolls, and with means for advancing and re tracting the mandrel through the passes of the series of sets in a direction right angular to the common axis of each set or pair of rolls, substantially as set forth.

6. In a machine for making tubes from hollow metal ingots, the combination of a series of sets of concave-faced rolls, each of which sets consists of a pair of concavefaced rolls arranged with their axes inclined to each other, and the passes of such sets diminish successively in diameter, with a mandrel adapted to be rotated about its longitudinal axis, at least as long as the tube to be formed, and which is passed through the passes formed by the rolls of the successive sets in a direction right angular to the common axis of each pair or set of rolls, and with means for advancing and retracting the mandrel through the passes of the series of sets in a direction right angular to the common axis of each set or pair of rolls, substantially as set forth.

7. In a machine for making tubes from hollow metal ingots, the combination of a series of sets of concave-faced rolls, each of which sets consists of a pair of concave-faced rolls arranged with their axes inclined to each other, and the concave working-faces of the rolls of each succeeding set of such series are more filled in and of greater diameter than the rolls of the set immediately preceding, so that the passes of the sets gradually diminish in diameter, with a mandrel at least as long as the tube I to be formed, and which is passed through the passes formed by the rolls of the successive sets in a direction right angular to the common axis of each pair or set of rolls, and with means for advancing and retracting the mandrel through the passes of the series of sets in a direction right angular to the common axis of each set or pair of rolls, substantially as set forth.

8. In a machine for making tubes from hollow metal ingots, the combination of a series of sets of concave-faced rolls, each of which sets consists of a pair ofconcavefaced rolls arranged With their axes inclined to each other, and the concave working-faces of the rolls of each succeeding set of such series are more filled in and of greater diameter than the rolls of the set immediately preceding, so that the passes of the sets gradually diminish in diameter, with a mandrel adapted to rotate about its longitudinal axis, at least as long as the tube to be formed, and which is passed through the passes formed by the rolls of the successive sets in a direction right angular to the common axis of each pair or set of rolls, and with means for advancing and retracting the mandrel through the passes of the series of sets in a direction right angular to the common axis of each set or pair of rolls, substantially as set forth.

9. In a machine for making tubes from hollow metal ingots, the combination of a series of sets of concave-faced rolls, each of which sets consists of a pair of concave-faced rolls arranged with their axes inclined to each other, housings for supporting said sets of rolls, and reversely-disposed segmental ways for the axes of each set of the rolls, the arrangement being such that each set of rolls is capable of an independent adjustment, substantially as set forth.

10. In a machine for making tubes from hollow metal ingots, the combination of a series of sets of concave-faced rolls,each of which sets consists of a pair of concave-faced rolls arranged with their axes inclined to each'other, housings for supporting said sets of rolls, re-

verselydisposed segmental ways for the axles of each set of the rolls, and means for securing the fixed adjustment of the axlesof the sets of rolls with respect to their segmental ways, the arrangement being such that each set of rolls is capable of an independent adjustment, substantially as set forth.

11. In a machine for making tubes from hollow metal ingots, the combination of a series of sets of concave-faced rolls, each of which sets consists of a pair of concave-faced rolls arranged with their axes inclined to each other, housings for supporting said sets of rolls, re-

ICC

versely-disposed segmental ways formed in or connected with the framing, boxings or bearings for the axles of the rolls of each set adapted to said segmental ways, and adj usting-arms connected with both the axles of the rolls of each set and with the framing, the arrangement being such that each set of rolls is capable of an independent adjustment, substantially as set forth.

12. In a machine for making tubes from hollow metal ingots, the combination of a series of sets of concave-faced rolls, each of which sets consists of a pair of concave-faced rolls arranged with their axes inclined to each other, housings for supporting said sets of rolls, reversely-disposed segmental ways for the axles of each set of the rolls, the arrangement being thereby such that each set of rolls is capable of an independent adjustment, and a mandrel adapted to be rotated about its longitudinal axis, and which is passed through the pass of each set of rolls in a direction right angular to the common axis of each set, substantially as set forth.

13. I11 a machine for making tubes from hollow metal ingots, the combination of a series of sets of concave-faced rolls,each of which sets consists of a pair of concave-faced rolls arranged with their axes inclined to each other, housings for supporting said sets of rolls, reversely-disposed segmental ways for the axles of each set of the rolls, means for securing the fixed adjustment of the axles of the sets of rolls with respect to their segmental ways, the arrangement being thereby such that each set of rolls is capable of an independent adjustment, and a mandrel adapted to be rotated about its longitudinal axis,and which is passed through the pass of each set of rolls in a direction right angular to the common axis of each set, substantially as set forth.

14;. In a machine for making tubes from hollow metal ingots, the combination of a series of sets of concave faced rolls, each of which setsconsists of a pair of concave-faced rolls arranged with their axes inclined to each other, housings for supporting said sets of rolls, reversely disposed segmental ways formed in or connected with the framing, boxings or bearings for the axles of the rolls of each set adapted to said segmental ways, adjusting-arms connected with both the axles of the rolls of each set, and with the framing,

the arrangement being thereby such that each set of rolls is capable of an independent adjustment, and a mandrel adapted to be rotated about its longitudinal axis, and which is passed through the pass of each set of rolls in a direction right angular to the common axis of each set, substantially asset forth.

15. In a machine for making tubes from hollow metal ingots, the combination of a se ries of sets of concave-faced rolls, each of which sets consists of a pair of concave-faced rolls arranged with their axesinclined to each other, housings for supporting said sets of rolls, re Versely-disposed segmental ways for the axles of each set of the rolls, the arrangement being thereby such that each set of rolls is capable of an independent adjustment, a mandrel adapted to be rotated about its longitudinal axis, and which is passed through the pass of each set of rolls in a direction right angular to the common axis of each set, and means for advancing and retracting the mandrel through the passes of the rolls of said series of sets, substantially as set forth.

16. In a machine for making tubes from hollow metal ingots, the combination of a series of sets of concavefaced rolls, each of which sets consists of a pair of concave-faced rolls arranged with their axes inclined to each other, housings for supporting said sets of rolls, reversely-disposed segmental ways for the axles of each set of the rolls, means for securing the fixed adjustment of the axles of the sets of rolls with respect to their segmental ways, the arrangement being thereby such that each set of rolls is capable of an independent adjustment, a mandrel adapted to be rotated about its longitudinal axis, and which is passed through the pass of each set of rolls in a direction right angular to the common axis of each set, and means for advancing and retracting the mandrel through the passes of the rolls of said series of sets, substantially as set forth.

17. In a machine for making tubes from hollow metal ingots, the combination of a series of sets of concave faced rolls, each of 00 which sets consists of a pair of concave-faced rolls arranged with their axes inclined to each other, housings for supporting said sets of rolls, reversely disposed segmental ways formed in or connected with the framing, boxings or bearings for the axles of the rolls of each set adapted to said segmental ways, adjusting-arms connected with both the axles of the rolls of each set with the framing, the arrangement being thereby such that each set of I I0 the rolls is capable of an independent adj ust ment, a mandrel adapted to be rotated about its longitudinal axis, and which is passed through the pass of each set of rolls in a direction right angular to the common axis of 5 each set, and means for advancing and retracting the mandrel through the passes of the rolls of said series of sets, substantially as set forth.

In testimony whereof I have hereunto 0 signed my name this 6th day of July, A. l). 1885.

STEPHEN P. M. TASKER.

In presence of J. BONSALL TAYLOR,

JOHN JoLLnY, J r.

Corrections in Letters Patent No. 331,584.

It is hereby certified that in Letters Patent No. 331,584., granted December 1, 1885, upon the application of Stephen P. M. Tasker, of Philadelphia, Pennsylvania, for an improvement in Machines for Making Tubes from Hollow Ingots, errors appear in the printed specification requiring correction, as follows: On page 4, in lines 112 and f 124, and page 5, lines 4, 20, 36, 52, 70, and 90, for such read which; and on page 5, line 112, for axes read moles and that the Letters Patent should be read with these corrections therein that the same may conform to the record of the case in the Patent Office.

Signed, countersigned, and sealed this 24th day of August, A. D. 1886.

-1 D. L. HAWKINS,

. Acting Secretary of the Interior. Oountersigned:

R. B. VANCE,

Acting Commissioner 0] Patents. 

